Title :
Integrated lock-in amplifier for sensor applications
Author :
Gnudi, A. ; Colalongo, L. ; Baccarani, G.
Author_Institution :
Università di Bologna, Bologna, Italy
Abstract :
An integrated lock-in amplifier for sensor applications is demonstrated. The circuit has been fabricated in a 0.7µm n-well CMOS process with analog features. The equivalent input noise is 17 nV/√Hz at 20 KHz, and the low-pass filter cut-off frequency can be varied in the sub-Hz range. The ability of resolving input steps of 100 nV at 20 KHz in the presence of a 32µV interference at only 5 Hz frequency offset is demonstrated.
Keywords :
CMOS process; Circuits; Consumer electronics; Costs; Cutoff frequency; Interference; Low-frequency noise; Low-noise amplifiers; Noise level; Sensor systems;
Conference_Titel :
Solid-State Circuits Conference, 1999. ESSCIRC '99. Proceedings of the 25th European
Conference_Location :
Duisburg, Germany
